How to Convert a Microsoft 365 User Mailbox to a Shared Mailbox or Group
Question details
The user needs to migrate messages, contacts, and sent items from a generic user mailbox to a specific named user, and then convert the generic address into a shared mailbox or Microsoft 365 group for team access.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Reorganizing team email structures to transfer existing data to a new user account while setting up collaborative access for the old generic email address.
- Observed behavior
- The business needs to transition a user mailbox to collaborative use while preserving its historical data by moving it to a new, designated user account.
Ensure you have Microsoft 365 Exchange administrator privileges and that the current user mailbox is active and licensed before beginning the export and conversion process.
Migrate Data and Convert to a Shared Mailbox
This is the standard approach to preserve historical data in a new account and convert the old address for multiple users to access.
A Microsoft 365 user mailbox can be directly converted into a shared mailbox, but it cannot be directly converted into a Microsoft 365 group. To ensure the previous data is transferred to a new user, you must export it first.
Log into the current user mailbox (e.g., the sales account) using the Outlook desktop app. Navigate to 'File' > 'Open & Export' > 'Import/Export' and select 'Export to a file'. Choose 'Outlook Data File (.pst)' and export all messages, contacts, and sent items.
Sign into the new user's email account in Outlook. Go back to the 'Import/Export' wizard, select 'Import from another program or file', choose the .pst file you just created, and import the historical data into the new mailbox.
Open the Microsoft 365 admin center. Go to 'Users' > 'Active users', select the original generic user mailbox, and under the 'Mail' tab, click 'Convert to shared mailbox'.
Once converted, remove the license from the old mailbox to save costs. Then, add the necessary team members to the shared mailbox delegation settings so they can read and send emails from the generic address.
Create a New Microsoft 365 Group
Use this method if your team requires group conversations, file sharing, and advanced collaboration features instead of a traditional shared inbox.
Experience a Seamless Office Workflow with WPS Office
While mailbox and Exchange server configurations require Microsoft 365 Admin tools, for your everyday document, spreadsheet, and presentation needs, WPS Office offers a free, lightweight, and highly compatible alternative.
- 1. Download the software: Visit the official WPS Office website and download the free installation package for your operating system.
- 2. Install and launch: Follow the on-screen instructions to install WPS Office, then open the application to access the all-in-one workspace.
- 3. Open your files: Simply drag and drop your existing Microsoft Office files into WPS Office to start viewing and editing them with full formatting compatibility.
Frequently Asked Questions
Can I directly convert a Microsoft 365 user mailbox into a Group?
No, a user mailbox cannot be directly converted into a Microsoft 365 group. You can only convert it to a shared mailbox. To use a group, you must create a new Microsoft 365 Group and assign the email address to it after freeing it from the original user.
Do I need a license for a shared mailbox in Microsoft 365?
Generally, shared mailboxes that are under 50GB do not require a separate user license. Once you convert a user mailbox to a shared mailbox, you can safely remove its license and assign it to another user.
What happens to the old email data when I convert a mailbox?
When converting to a shared mailbox, all existing emails, calendars, and contacts remain intact. However, if you want to transfer that specific data to a completely new user account, you must export it to a .pst file and import it to the new account.
How do team members access a newly converted shared mailbox?
Once converted, an administrator must assign 'Read and manage' and 'Send as' permissions to authorized users. These users can then access the shared mailbox directly through their own Outlook desktop client or Outlook on the web.
